Modal based stability analysis of power systems using energy functions

Khorasani, K. ; Pai, M. A. ; Sauer, P. W. (1986) Modal based stability analysis of power systems using energy functions International Journal of Electrical Power & Energy Systems, 8 (1). pp. 11-16. ISSN 0142-0615

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In this paper a physically based decomposition technique is exploited to perform direct stability analysis of power systems using the energy function method. The slow-coherency analysis decomposes the system into r areas associated with (r- 1) slow modes of the linearized system. The centres of inertia (COIs) of these areas from the slow subsystem and the rest of the fast modes are associated with different areas. The system transient energy function E is decomposed into Eslow associated with the slow variables of the slow subsystem, Efast associated with the fast variables of the r-areas and Efast-slow which is a function of both fast and slow variables. Depending on the fault location and strength of connection between areas, the sum of Eslow, Efast-slow and Efast of the disturbed arease constitutes a good approximation to the system energy function. Using this partial E-function and the potential energy boundary surface (PEBS) method, both Ecr and tcr are computed. Numerical results on a 10-machine 39-bus system are presented in support of the technique.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Network Analysis; Transient Stability; Power System Element Modelling
ID Code:24766
Deposited On:30 Nov 2010 09:16
Last Modified:13 Jun 2011 04:41

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